A133915 - cp's OEIS frontend

A133915 a(n) = Sum_{i=0..n} C(2n-i,n+i)2^i.

n	a(n)
0	1
1	2
2	8
3	30
4	116
5	452
6	1772
7	6974
8	27524
9	108852
10	431168
11	1709996
12	6788536
13	26971856
14	107235668
15	426594110
16	1697855876
17	6760326116
18	26927208368
19	107288242820
20	427596003416
21	1704598377176
22	6796820059928
23	27106584400460
24	108123625907816
25	431355955330952

[1, 2, 8, 30, 116, 452, 1772, 6974, 27524, 108852, 431168, 1709996, 6788536, 26971856, 107235668, 426594110, 1697855876, 6760326116, 26927208368, 107288242820, 427596003416, 1704598377176, 6796820059928, 27106584400460, 108123625907816, 431355955330952]

cp's OEIS Frontend

A133915 a(n) = Sum_{i=0..n} C(2n-i,n+i)2^i.

Table of values

List of values

cp's OEIS Frontend

A133915 a(n) = Sum_{i=0..n} C(2*n-i,n+i)*2^i.

Table of values

List of values

A133915 a(n) = Sum_{i=0..n} C(2n-i,n+i)2^i.